Mathematics - Permutation Combination
Practise 4 IAT (IISER) previous year questions on Permutation Combination, compiled from papers spanning 2019 to 2026. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty IAT (IISER) tests.
Permutation Combination has been asked in 3 of the 9 years of IAT (IISER) papers analysed (2017–2026), with 4 questions in all. 25% of them were easy, 75% moderate and 0% tough. Most of its questions came from 2026, with 1 question that year. In the last three years (2023–2026) it had 2 questions across 3 papers, about 0.7 per paper.
The chapter's 3 topics are not weighted equally: Permutation (2 questions, 50%), Combination (1 question, 25%), and Selection of one or more item (1 question, 25%) have been asked the most. Permutation has also led over the last five years, with 2 questions.
- 1Let be two integers such that . What is the total number of functions such that are all distinct?2026Permutation
- 2How many three digit numbers divisible by 5 are there in which no digits are repeated?2025Permutation
- 3What is the total number of distinct divisors of2023Selection of one or more item
- 4Let be a non-empty set such that the total number of subsets of containing at most two elements is equal to 16 . Then, the number of element2019Combination
Frequently Asked Questions
1.How many questions are available for Permutation Combination?
This chapter includes 4 questions compiled from IAT (IISER) papers spanning 2019 to 2026.
2.Are these questions only from IAT (IISER), or from other exams too?
These are IAT (IISER) questions specifically for the Permutation Combination chapter. Questions from other exams like JEE Main or NTA Abhyas (JEE Main) are organised separately under their respective exam sections.
3.Is Permutation Combination an important chapter for IAT (IISER) Mathematics?
Permutation Combination has appeared in 4 of the 10 years of IAT (IISER) papers covered here, with 4 questions across 4 papers - about one per paper it appears in.
4.What is the difficulty level of Permutation Combination questions in IAT (IISER)?
Of the 4 questions analysed for this chapter, 25% are easy, 75% moderate and 0% tough. 2026 had the most, with 1 question.
5.Which topics in Permutation Combination should I focus on?
These topics have carried the most weightage in Permutation Combination:
- Permutation - 2 questions (50%)
- Combination - 1 question (25%)
- Selection of one or more item - 1 question (25%)
6.Is Permutation Combination's weightage in IAT (IISER) going up or down?
Across all 4 papers analysed, Permutation Combination has averaged about 1.0 questions per paper. In the last three years (2023–2026), that average has fallen, at about 0.7 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.